Navigate to Home tab. Select New SWMM Project from the drop-down list of New Project button
Click the Properties tab in Project Manager which by default is on the right side of the VOSWMM main interface. Change the Unit to CMS and the LinkOffset to Elevation.
Click the Save Project button in the Home tab. In the pop-up window, navigate to the folder where you want to save your project, for example, “…\model\practice” and give a name in the File Name field, for example “dual_drainage”. Click Save.